Battery charger



FIG. 1 is a perspective view of a battery charger showing our new design;

FIG. 2 is a front view of the design;

FIG. 3 is a rear view of the design;

FIG. 4 is a left side view of the design;

FIG. 5 is a right side view of the design;

FIG. 6 is a top view of the design; and,

FIG. 7 is a bottom view of the design.

The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the battery charger and form no part of the claimed design. 

The ornamental design for a battery charger, as shown and described. 